From the site: "The Association for Computational Linguistics is THE international scientific and professional society for people working on problems involving natural language and computation. Membership includes the ACL quarterly journal,Computational Linguistics , reduced registration at most ACL-sponsored conferences, discounts on ACL-sponsored publications, and participation in ACL Special Interest Groups." Note: ISCA and ACL offer 25% discounts on membership fees to members of either organization who are *not* currently members of the other organization. I.e, ISCA members who are not currently ACL members may save 25% on the ACL membership fee and vice versa.